Editorial: Sustainable eco-technologies for water and wastewater treatment Eldon R. Rene, Li Shu and Veeriah Jegatheesan Technogenic metallic elements in biomass and their effects on biomass product properties Edita Baltrėnaitė, Pranas Baltrėnas and Donald Huisingh Bacterial community analysis of sulfate-reducing granular sludge exposed to high concentrations ofuranium Taotao Zeng, Shiqi Zhang, Wei Liao, Hualong Ma, Piet N. L. Lens and Shuibo Xie Removal of cyanotoxins in drinking water using ozone and ozone-hydrogen peroxide (peroxone) Guhankumar Ponnusamy, Lijo Francis, Kavithaa Loganathan, Oluwaseun O. Ogunbiyi, Saad Jasimand Jayaprakash Saththasivam Photocatalytic degradation of Irgalite violet dye using nickel ferrite nanoparticles Shiljashree Vijay, Raj Mohan Balakrishnan, Eldon R. Rene and Uddandarao Priyanka Decolorization of Reactive Blue 220 aqueous solution using fungal synthesized Co3O4 nanoparticles Riya Sidhikku Kandath Valappil, Ajuy Sundar Vijayanandan and Raj Mohan Balakrishnan Anthropogenic markers for source tracking of fecal contamination in Bayou Lafourche: a major drinking water source in Southeast Louisiana, USA Stacy Martinez, Marilyn Kilgen, Angie Corbin, Rajkumar Nathaniel, Balaji Ramachandran and Raj Boopathy Assessment of drinking water quality in regional New South Wales, Australia S. T. M. L. D. Senevirathna, Andrea M. Goncher and Aaron Hollier Stress response and toxicity studies on zebrafish exposed to endosulfan and imidacloprid present in water Barzah Muazzam, Kashif Munawar, Imtiaz Ahmad Khan, Sarwat Jahan, Mazhar Iqbal, MuhammadRafique Asi, Abida Farooqi, Adila Nazli, Ijaz Hussain and Mazhar Iqbal Zafar Phytoremediation of nitrate contaminated water using ornamental plants S. Shyamala, N. Arul Manikandan, Kannan Pakshirajan, Van Tai Tang, Eldon R. Rene, Hung-Suck Park and Shishir Kumar Behera Design and operation of submerged layer in bioretention for enhanced nitrate removal Junyu Zhang, Rajendra Prasad Singh, Yunzhe Liu and Dafang Fu Experimental study on filter media using locally available materials in bioretention Feikai Yang, Rajendra Prasad Singh and Dangfang Fu Nitrogen removal performance of microbial fuel cell enhanced bioretention system Yajun Wang, Rajendra Prasad Singh, Junyu Zhang, Yan Xu and Dafang Fu Removal of low-concentration phosphorus by efficient phosphorus removal composite-based ecological floating beds Yan Liu, Juanjuan Lv and Rajendra Prasad Singh Endogenous respiration process analysis between aMBR and UV/O3-aMBR for polluted surface water treatment Lu Li, Kang Song and Chettiyappan Visvanathan Optimization method for joint operation of a double-reservoir-and-double-pumping-station system: a case study of Nanjing, China Zhihao Gong, Xiaohong Jiang, Jilin Cheng, Yi Gong, Xing Chen and Haomiao Cheng Economic and environmental impact analysis of ammoniacal nitrogen removal from landfill leachate using sequencing batch reactor: a case study from Czech Republic R. Badri Narayan, B. I. Zargham, Audrey Ngambia and Arlieza R. Riyanto Remediation of groundwater contamination from an old, non-functional landfill in Hořkovec open castmine, Czech Republic Adyl Anvarov, Adelaida Pelaez Angel, Beatriz Felices Rando and Jimena Lazaro Gil